[Webkit-unassigned] [Bug 195556] New: Unable to extend the DocumentFragment class

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195556

            Bug ID: 195556
           Summary: Unable to extend the DocumentFragment class
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrea.giammarchi at gmail.com

The following code will fail the assertion that would, otherwise, pass in every other browser that implements classes.

(function () {'use strict';
  class WaitWhat extends DocumentFragment {}
  console.assert(
    (new WaitWhat) instanceof WaitWhat,
    `any instance of a DocumentFragment extend fails`
  );
}());

This is true even through Reflect.construct

(function () {'use strict';
  class WaitWhat extends DocumentFragment {}
  console.assert(
    Reflect.construct(DocumentFragment, [], WaitWhat) instanceof WaitWhat,
    `any instance of a DocumentFragment extend fails`
  );
}());

The expected behavior is that it is possible to extend the DocumentFragment as any other built-in class.

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